616 CODIACEAE. 



5. Halimeda tridens (Ell. & Soland.) Lamour. Hist. Polyp. 308. 1816. 



CoraUina tridens Ell. & Soland. Nat. Hist. Zooph. 109. 1786. 

 Corallina incrassata Ell. & Soland. loc. cit. 111. 

 Halimeda incrassata Lamour. Hist. Polyp. 307. 1816. 

 Halimeda hrevicaulis Kiitz. Tab. Phyc. 8: 11. pi. S5. f. II. 1858. 



Very common on a sandy or muddy bottom from near the low-water mark down 

 to 40 meters or more. New Providence, Rose Island, Andros, Great Bahama, North 

 Cat Cay, Green Cay. Exuma Chain. Cat Island. \Yatlin.£j's Island. Atwood Cay. 

 Marigiiana, Caicos Islands, Castle Island, Great Ragged Island, Salt Cay, and 

 Angnilla Isles : — Bermuda and Florida to Guadeloupe ; also in the tropical seas of 

 the Eastern Hemisphere. Type from the Bahama Islands. 



6. Halimeda Monile (Ell. & Soland.) Lamonr. Hist. Polyp. 306. 1816. 



Corallina Monile Ell. & Soland. Nat. Hist. Zooph. 110. 1786. 

 Halimeda incrassata monilis Harv. Ner. Bor.-Am. 3: 24. 1858. 

 Halimeda tridens Monile M. A. Howe, Bull. Torrey Club 32: 564. 1905. 



Common on a sandv bottom, often with H. tridens and H. simulons. but dis- 

 tinct. Rose Island, Cat"^ Island, Watling's Island, Mariguana, Caicos Islands, Great 

 Ragged Island, Salt Cay, and Anguilla Isles : — 'Bermuda and Florida to Guadeloupe 

 and Panama (Colon). Type from Jamaica. 



7. Halimeda simulans M. A. Howe, Bull. Torrey Club 34: 503. pi. S9. 1907. 



On a sandy bottom, rocks, old corals, etc.. from near low-water mark down to 

 a depth of several meters. Berry Islands, Atwood Cay. Mariguana, Caicos Islands, 

 and Great Ragged Island : — Bermuda. Florida. Cuba, .Tamaica. Porto Rico, American 

 Virgin Islands, and Panama (Colon). Type from Culebra Island, Porto Rico. 



8. Halimeda favulosa M. A. Howe, Bull. Torrey Club 32: 563. pi. 23; pi. 24; 



pi. 26. f. 1-6. 1905. 



On a sandy bottom in shallow water. Rose Island and Exuma Chain. Type 

 from Cave Cays, Exuma Chain. Apparently endemic. 



9. Halimeda lacrimosa M. A. Howe, Bull. Torrey Club 36 : 93. pi. 4. f. 1 ; pi. 6. 



f. 3-11. 1909. 



On a sandy bottom from near low-water mark down to a depth of 10-20 

 meters or more. Exuma Chain, Mariguana, and Great Ragged Island : — Cuba. 

 Type from Mariguana. 



8. CODIUM Stackh. Ner. Brit, xvi, xxii, xxiv. 1797. 



Lamarckia Olivi, Zool. Adriat. 258. 1792. Not Lamarckia Medic. 1789. 



Spongodium Lamour. Essai 71, 72. 1813. 



Agardhia Cabrera; Ag. Syn. Alg. Scand. xxiv. 1817. 



Thallus mostly erect and fruticose. 



Peripheral utricles cylindric-clavate, mostly 75-200 ^ in max. diam. ; thallus dull 

 and rather rigid when dry, the branches not con- 

 stricted at base. 1. C. tomentosum. 

 Periphpral ntri'^'ps obovoid. obf^nnic. ov soblet-shappd. 

 mostly ].50-.3O0;u in max. diam.: thallus commonly 

 nitent and rather flaccid when dry, the branches con- 

 stricted at base. 2. C.isthmocladtim.. 

 Thallus adherent, prostrate, or repent. 3. C. intertextum. 



1. Codiiim tomentosum (Huds.) Stackh. Ner. Brit. xxiv. 1797. 

 Fucus tomentosus Huds. El. Angl. 584. 1778. 



On rocks, etc. in shnllow wnt^r. North Cat Cay. Eleuthera. Atwood Cay. and 

 Caicos Islands : — Bermuda and North Carolina to Panama (Colon") and South 

 America ; widely distributed in the warmer seas. Type from Great Britain. 



QocUnm deoorticatutn (Woodw.) M. A. Howe (C. elonqatum Ag.) has not yet 

 been reported from the Bahamas, but is likely to occur. It differs from C. tomen- 

 tosiim in being more elongate, more sparingly branched, by flattened expansions 

 under the- dichotomies, and by the much larger utricles. 



